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Merge pull request #19880 from DirectXMan12/feature/limit-ebs-scheduler-predicate

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k8s-merge-robot
2016-02-05 09:26:42 -08:00
parent 06060d4d77 2d436ff080
commit 175d0c57f2
4 changed files with 427 additions and 0 deletions
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47
plugin/pkg/scheduler/algorithmprovider/defaults/defaults.go
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@@ -18,14 +18,41 @@ limitations under the License.
package defaults
import (
"os"
"strconv"
"k8s.io/kubernetes/pkg/util/sets"
"k8s.io/kubernetes/plugin/pkg/scheduler"
"k8s.io/kubernetes/plugin/pkg/scheduler/algorithm"
"k8s.io/kubernetes/plugin/pkg/scheduler/algorithm/predicates"
"k8s.io/kubernetes/plugin/pkg/scheduler/algorithm/priorities"
"k8s.io/kubernetes/plugin/pkg/scheduler/factory"
"github.com/golang/glog"
)
// Amazon reccomends having no more that 40 volumes attached to an instance,
// and at least one of those is for the system root volume.
const DefaultMaxEBSVolumes = 39
// GCE instances can have up to 16 PD volumes attached.
const DefaultMaxGCEPDVolumes = 16
// getMaxVols checks the max PD volumes environment variable, otherwise returning a default value
func getMaxVols(defaultVal int) int {
if rawMaxVols := os.Getenv("KUBE_MAX_PD_VOLS"); rawMaxVols != "" {
if parsedMaxVols, err := strconv.Atoi(rawMaxVols); err != nil {
glog.Errorf("Unable to parse maxiumum PD volumes value, using default of %v: %v", defaultVal, err)
} else if parsedMaxVols <= 0 {
glog.Errorf("Maximum PD volumes must be a positive value, using default of %v", defaultVal)
} else {
return parsedMaxVols
}
}
return defaultVal
}
func init() {
factory.RegisterAlgorithmProvider(factory.DefaultProvider, defaultPredicates(), defaultPriorities())
// EqualPriority is a prioritizer function that gives an equal weight of one to all nodes
@@ -80,6 +107,26 @@ func defaultPredicates() sets.String {
),
// Fit is determined by the presence of the Host parameter and a string match
factory.RegisterFitPredicate("HostName", predicates.PodFitsHost),
// Fit is determined by whether or not there would be too many AWS EBS volumes attached to the node
factory.RegisterFitPredicateFactory(
"MaxEBSVolumeCount",
func(args factory.PluginFactoryArgs) algorithm.FitPredicate {
// TODO: allow for generically parameterized scheduler predicates, because this is a bit ugly
maxVols := getMaxVols(DefaultMaxEBSVolumes)
return predicates.NewMaxPDVolumeCountPredicate(predicates.EBSVolumeFilter, maxVols, args.PVInfo, args.PVCInfo)
},
),
// Fit is determined by whether or not there would be too many GCE PD volumes attached to the node
factory.RegisterFitPredicateFactory(
"MaxGCEPDVolumeCount",
func(args factory.PluginFactoryArgs) algorithm.FitPredicate {
// TODO: allow for generically parameterized scheduler predicates, because this is a bit ugly
maxVols := getMaxVols(DefaultMaxGCEPDVolumes)
return predicates.NewMaxPDVolumeCountPredicate(predicates.GCEPDVolumeFilter, maxVols, args.PVInfo, args.PVCInfo)
},
),
)
}